Energy transfer for gcse homework

[andymc]

Can anyone help please or point me to a text I can use to help my daughter
Thanks
Andy

[andymc]

Is it not 50x300?

I'm well out of practice

[andymc]

And next pls

[andymc]

She maintains it's been a supply teacher who is rarely on time, they're all struggling, I'll speak to the school
Andy

[andymc]

She's 13

[andymc]

I did this at gcse ages ago, I now sell cars for a living so we all know how well I stuck in

[andymc]

What equation do I use?

Thanks

[andymc]

Thanks for all the help